TWI796037B - Ozone fumigation method - Google Patents

Abstract

An ozone fumigation method, including a sealing step, a preparation step, a fumigation step, and a clean step. In the sealing step, the fumigated substance is set in a closed space. In the preparation step, at least one ozone generator is prepared. In the fumigation step, the ozone produced by the ozone generator is led into the enclosed space to fumigate the fumigated substance, and then it is kept for a period of time. In the clean step, reduce or eliminate the ozone gas concentration in the enclosed space.

Description

Ozone fumigation method

The invention relates to an ozone fumigation method, in particular to an efficient and safe fumigation method for removing harmful organisms on fumigated objects and maintaining the quality of the fumigated objects.

Grains after harvest, such as rice, are often plagued by diseases and insect pests, and there are many types of rice worms. The most common type of rice worm is the rice weevil (weevil), which is an insect that grows on the surface of the grain and uses the grain as food. In warm and humid areas, it is more suitable for the reproduction of such insects. Therefore, in order to prevent the grains from being eroded by diseases and insect pests, the general granaries or grain merchants usually fumigate the grains and seal them up to ensure that the harvested grains will not be damaged by insects. Reduced by pests.

The current process of fumigation to kill harmful organisms is generally divided into fumigation step and exhaust step. In the fumigation step, the fumigated object is first sealed with a canvas with a thickness of 1.6mm and then put in solid aluminum phosphide. Toxic gas phosphine (PH ₃ ) is produced by absorbing water vapor and oxygen in a confined space, usually producing phosphine gas with a concentration above 1500ppm to kill harmful organisms, and it is covered for 7 to 14 days to ensure effective combating Kill pests.

In the exhaust step, the traditional method is to draw the air through the circular exhaust pipe to the outside, and measure the internal phosphine gas concentration after about 60 minutes of execution time. According to regulations, the phosphine concentration must be lower than 0.3ppm. This batch of goods can be used, so it will continue to pump for more than 4 hours, and then after the canvas is lifted, it must be left to stand for 5~7 days before the batch of goods can reach the use standard.

Aluminum phosphide (English: Aluminum phosphide) is a highly toxic inorganic compound. It is generally used in the semiconductor industry and the agricultural industry. It is listed as a first-class highly toxic and a first-class carcinogen in agriculture. It is highly lethal at low doses for mammals. It is mainly used Used as insecticide, rodenticide, or fumigant (such as Dexunbao products launched by Haodasheng), and widely used in food, medicinal materials, wood, tobacco, coffee, miscellaneous grains, containers, etc. to remove harmful organisms, phosphorus Aluminum phosphide is stable when kept dry and airtight. Aluminum phosphide combines with moisture in the air to produce toxic phosphine gas (chemical formula is AlP+3H ₂ O→Al(OH) ₃ +PH ₃ ). Phosphine gas is a particle The nematode electron transport chain complex inhibitor can achieve the effect of killing harmful organisms by inhibiting the respiration of organisms.

Although the above-mentioned aluminum phosphide has a good effect of killing harmful organisms as a fumigant, it is also toxic to humans, especially during the exhaust process, phosphine gas has the characteristic of being easily adsorbed on objects, so it cannot be guaranteed to adhere to The phosphine gas on the object to be fumigated has been completely dissipated. Among them, the greater the density and the smaller the volume of the object to be fumigated, the greater the amount of residual phosphine gas attached (such as the difference between flour and rice grains), and the fumigated There is also the need to operate within a time limit (such as white rice must be vacuum-packed immediately after fumigation to avoid secondary pollution). Exposure to phosphine environment, at this time, the staff may cause symptoms such as headache, weakness, nausea, vomiting, severe breathing difficulties, etc. The early symptoms of acute phosphine poisoning include diaphragm pain, nausea, vomiting, excitement and breathing Phosphorus smells, and high concentrations can cause weakness, bronchitis, pulmonary edema, shortness of breath, convulsions, and even death.

Since phosphine gas is toxic to the human body, after the fumigation operation, the phosphine gas in the fumigated object must be effectively removed. Generally, exhaust equipment is used to extract the phosphine gas in the fumigated object and discharge it. Put it in an open and unoccupied place, but the phosphine gas released in the atmosphere is still toxic. It needs to be decomposed naturally in the atmosphere depending on the environmental conditions. It only takes a few minutes in an open and ventilated place, but usually it takes It takes hours or even days to decompose completely to reach a level that is harmless to the human body, but the early methods must take more than a week to let the toxic gas in the fumigated object be discharged and decompose naturally, to less than 0.3ppm prescribed standards.

In view of this, the applicant of this case once proposed an invention application No. 110135432 on September 23, 110, which disclosed a method for using ozone to neutralize the poisonous phosphine gas, and has the following four beneficial effects: 1. 1. There is no air pollution and secondary poisoning. 2. Reduce residual poisonous gas. 3. Shorten the purification time. 4. Prevent the invasion of foreign species. This method can effectively shorten the purification time of phosphine gas after fumigation. It is easy to combine with water vapor to produce toxic gas of phosphine, which is highly toxic in nature, and there are doubts about secondary pollution when discharged into the environment, and there are also problems with the stability of storage and transportation. Therefore, the applicant in this case investigated Relevant literature is expected to propose a safer solution that does not use aluminum phosphide.

Therefore, how to shorten the working time when carrying out grain fumigation, reduce the harm to the environment and staff, and how to fumigate pests without using aluminum phosphide to produce phosphine poisonous gas is the purpose of the present invention.

In view of this, the purpose of the present invention is to provide a kind of ozone fumigation method, this ozone fumigation method comprises a sealing step, a preparation step, a fumigation step, and a purification step, at first in this sealing step, the object to be fumigated is set In a closed space, then in the preparation step, at least one ozone generator is prepared, and then in the fumigation step, the ozone produced by the ozone generator is introduced into the closed space to fumigate the fumigated object, and stand for a period of time, Finally, in the purification step, the concentration of ozone gas in the enclosed space is reduced or eliminated.

Another technical means of the present invention is that in the above-mentioned preparation step, the ozone generator is placed in the closed space, and after the ozone generator extracts the air in the closed space to produce ozone gas, it releases the ozone gas back into the closed space. space.

Another technical means of the present invention is that in the above preparation step, the ozone generator is placed outside the confined space, and the ozone generator introduces the generated ozone gas into the confined space through a pipeline.

Another technical means of the present invention is to use a concentration sensor to detect the concentration of ozone gas in the enclosed space in the above-mentioned fumigation step, and to pass through when the concentration of ozone gas is higher or lower than a preset value. A controller turns on and off the ozone generator.

Another technical means of the present invention lies in that in the above-mentioned fumigation step, the airtight state of the airtight space is maintained by standing still for 7-10 days.

Another technical means of the present invention lies in that in the above-mentioned fumigation step, the release amount of ozone in the enclosed space is 10-120 grams per hour.

Yet another technical means of the present invention is that in the above-mentioned fumigation step, it further includes using a monitor to remotely monitor the fumigation status in the confined space, and the monitor can be connected with an external mobile device.

Another technical means of the present invention lies in the above-mentioned fumigation step, when the concentration sensor detects that the ozone concentration in the enclosed space reaches 5ppm, the controller is controlled to turn off the ozone generator, and when the concentration sensor detects that the When the ozone concentration in the confined space is less than 3ppm, the controller is controlled to start the ozone generator.

Another technical means of the present invention is that in the above-mentioned preparation step, the ozone generator uses a high-voltage current of a certain frequency to create a high-voltage electric field, so that the oxygen molecules in or around the electric field undergo electrochemical reactions to produce ozone.

Another technical means of the present invention lies in that in the above-mentioned purification step, reducing or eliminating the ozone gas concentration in the confined space is to ventilate and exhaust in a diagonal manner in the confined space to rapidly decompose the ozone in the air.

The beneficial effect of the present invention is that ozone can directly kill bacteria, molds, and harmful organisms on the fumigated object and delay the aging and decay time of the fumigated object, because the ozone released in the closed space is in the form of gas , so it can be actively diffused to any corner in the confined space, without blind spots or dead angles, and because ozone has the characteristics of photodecomposition and reduction to oxygen at room temperature, there is no secondary pollution and residue in subsequent treatment.

The features and technical contents of the relevant patent applications of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings.

Referring to Fig. 1, 2, 3, it is a preferred embodiment of the ozone fumigation method of the present invention, the ozone fumigation method includes a sealing step 901, a preparation step 902, a fumigation step 903, and a purification step 904.

First, in the sealing step 901, the fumigated objects are placed in a closed space 11. Preferably, a container such as a space bag 31 can be used to contain the fumigated objects for stacking in the warehouse, and then an insulated The air canvas 12 covers the object to be fumigated, and the canvas 12 cooperates with the ground 13 to surround and define the confined space 11 . In practice, the object to be fumigated can also be placed in the enclosed space 11 of a building or a container.

It is worth mentioning that since ozone 22 has the characteristics of photodecomposition and reduction to oxygen at normal temperature, the aforementioned airtight space 11 can also use this fumigation method even if it is not completely airtight, and should not be limited to this. Among them, The fumigated objects generally refer to crops, processed agricultural products, furniture, logs, books, paper, and important documents, etc. The processed agricultural products include processed products such as flour, wheat flour, shredded tobacco, etc. Cereals such as tobacco and traditional Chinese medicine also include roots, stems, leaves and flowers. Furniture is a product made of wood materials.

Among them, the canvas 12 of this preferred embodiment can use a thickness of 1.6mm and see-through cloth to form the enclosed space 11. When the see-through canvas 12 covers the fumigated object, the air in the enclosed space 11 can be directly viewed from the outside. It is no longer necessary to lift the canvas 12 for confirmation. In practice, a canvas 12 with a thickness greater than 1.6mm can be used, or covered with an opaque canvas 12, and should not be limited thereto.

Next, in the preparation step 902 , at least one ozone generator 21 is installed in the enclosed space 11 according to the size of the enclosed space 11 . In addition to directly setting the ozone generator 21 in the closed space 11 , the ozone generator 21 can also be set outside the closed space 11 . In this preferred embodiment, the ozone generator 21 uses a high-voltage current of a certain frequency to create a high-voltage corona electric field, so that the oxygen molecules in the electric field or around the electric field undergo an electrochemical reaction, thereby producing ozone 22 gas. The ozone 22 gas can be obtained by electrolysis of water or other methods. In practice, the ozone 22 produced by the ozone generator 21 can be a model that produces 10 grams per hour, or a model that produces 120 grams per hour. , depending on the size and shape of its closed space 11, should not be limited thereto.

Then, in the fumigation step 903, the ozone 22 produced by the ozone generator 21 is introduced into the closed space 11 for release. Since the ozone 22 itself has the characteristic of being reduced to oxygen at normal temperature, it cannot be stored and must be used on site. Manufacturing, wherein the ozone 22 released in the confined space 11 will diffuse and move due to the difference in concentration, and the movement of the ozone 22 will not only diffuse to the surroundings of the space bag 31, but also enter the gaps of the fumigated objects inside the space bag 31. The object to be fumigated is fumigated. At this time, the ozone 22 gas will undergo oxidation and reduction to kill harmful organisms on the object to be fumigated.

When ozone 22 (O3) is released in the confined space 11 for flow and diffusion (Diffusion), the ozone 22 (O3) moving through the difference in concentration can actively diffuse to any corner of the confined space 11 and interact with harmful Biology undergoes a strong oxidation-reduction reaction. The sterilization principle of ozone 22: the sterilization process is a biochemical oxidation reaction. Ozone 22 can directly oxidize the cell body of the bacteria, that is, destroy its DNA to achieve the inhibitory effect, and also has a certain effect on the RNA of the virus. Destructive effect, has a certain oxidation effect on various toxins and reduces their toxicity. Ozone 22 can oxidize and decompose the enzymes required for glucose inside bacteria, destroy the biological activity of bacteria and cause them to die. Ozone 22 can directly interact with bacteria and viruses, destroy Their organelles, DNA, and RNA destroy the metabolism of bacteria and viruses, leading to the death of bacteria and viruses. Ozone 22 can penetrate the cell membrane tissue and invade into the cell, acting on the lipoprotein of the outer membrane and the lipopolysaccharide inside, making bacteria Permeability distortion occurs and dissolves to death, and finally achieves a very good poisonous effect.

During fumigation, the concentration of ozone 22 in the enclosed space 11 needs to be between 3 and 5 ppm, and maintain the concentration of ozone 22 in the enclosed space 11 for 7 to 10 days, so that the ozone 22 gas can kill the Preferably, the concentration of ozone 22 in the confined space 11 can be higher than 5ppm, and the concentration of ozone 22 in the confined space 11 can be maintained for 7-21 days to have a very good killing effect on bacteria, molds and harmful organisms.

It is worth mentioning that the ozone generator 21 of the present invention can be arranged in the enclosed space 11 (shown in FIG. 2 ), directly extract the air in the enclosed space 11 to produce ozone 22 gas, and release it in the enclosed space 11 ozone22. It is also possible to arrange the ozone generator 21 outside the enclosed space 11 (shown in FIG. 3 ), obtain outside air to produce ozone 22, and then use the air guide line to introduce the produced ozone 22 into the enclosed space 11, And continue to output ozone 22 in the enclosed space 11 .

In actual use, a plurality of ozone concentration sensors can be installed in different areas of the enclosed space 11 to detect the concentration of ozone 22 in different areas. Preferably, the ozone concentration sensor can control the opening and closing of the ozone generator 21 according to the detected ozone 22 gas concentration. In actual implementation, when the ozone concentration sensor detects that the closed space 11 When the concentration of ozone 22 is less than 3ppm, control the controller to start the ozone generator 21 to generate ozone 22, increase the concentration of ozone 22 in the closed space 11, and when it is detected that the concentration of ozone 22 in the closed space 11 reaches 5ppm, then turn off This ozone generator 21 stops producing ozone 22, and the concentration condition setting of this ozone 22 can be 10～20ppm, also can be 80～100ppm, when the concentration of ozone 22 gas is higher, the required standing time is shorter, so The above concentration settings should not be limited to this.

Referring to FIG. 4 , finally in the purification step 904 , the concentration of ozone 22 gas in the enclosed space 11 is reduced or eliminated. In this preferred embodiment, pipelines are respectively arranged at the diagonal positions of the confined space 11 to carry out the exhaust action, and the ozone 22 gas is extracted from the diagonal of the confined space 11 and discharged to the external environment, so as to quickly Reduce the concentration of ozone 22 in the confined space 11, so that ozone 22 can be quickly decomposed and eliminated in the air. Of course, in actual implementation, pipelines can also be arranged in a diagonal manner, but the pipeline in one corner performs air supply action , the air from the external environment is sent into the enclosed space 11, and the pipeline in the other corner performs an air pumping action to extract the ozone 22 gas in the enclosed space 11 and discharge it to the external environment, so as to quickly reduce or eliminate the enclosed space. 11 Ozone 22 gas concentration.

Ozone 22 has the characteristic of photodecomposition, it will decompose into oxygen quickly after contacting air, no residue will be generated and it will not pollute the environment, and when the concentration of ozone 22 is less than 0.1ppm, it will not be harmful to the environment. The human body causes injury, at this moment, can carry out follow-up operation in this confined space 11 by professional person wearing protective equipment.

It is worth mentioning that when the number of fumigants to be fumigated is large, the ozone 22 required to be used in the confined space 11 is also large, and because of the large number of fumigants, it is easy to generate gas in the piled up fumigants. In the area of circulation, at this time, decentralized multi-point placement can be carried out in the confined space 11, and an ozone concentration sensor and an ozone generator 21 are all set at each placement point, or a delivery point is set at each placement point The pipeline of ozone 22 gas, and the pipeline is provided with an ozone concentration sensor. The multiple concentration sensors can detect the concentration of ozone 22 in the area where it is placed and control the ozone generator 21 to output ozone 22. In this The multi-point setting in the confined space 11 can not only make the ozone 22 diffuse through the concentration gradient difference in the area with less air circulation, but also can quickly and evenly fumigate the fumigated objects in the confined space 11 .

Referring to Figures 1, 2, 3, and 5, preferably, the present invention can also utilize motion control technology to integrate multiple ozone concentration sensors and ozone generators 21, and use monitoring equipment to remotely observe the confined space For the fumigation situation in 11, the ozone 22 gas concentration and fumigation status in the monitoring area are directly displayed in mobile device APPs such as mobile phones or tablet computers. For example, when a mobile device 41 executes an ozone 22 purification application program (APP) , the four ozone concentration sensors that can be set in this confined space 11, and utilize the technology of wireless communication to carry out the real-time transmission of monitoring data, and each ozone concentration sensor is electrically connected with ozone generator 21, and the ozone The concentration sensor can control the operation or shutdown of the ozone generator 21 according to the detected ozone 22 gas concentration. The mobile device 41 can not only check the ozone 22 gas concentration data detected by each ozone concentration sensor, The fumigation situation in the confined space 11 can also be observed remotely, and there is no need to arrange staff to monitor the concentration of ozone 22 at the job site.

In addition, the ozone fumigation method of the present invention can also be used in closed warehouse operations (sealing operations). Before the sealing step 901, it is necessary to evaluate and confirm whether the building has the possibility of an airtight warehouse. If possible, it can be used around the doors and windows. Apply super glue and seal it with a see-through canvas 12 with a thickness of 1.6mm. The cracks on the wall and the ground are also sealed in the same way. The sealing operation is carried out in the above-mentioned way, and industrial butter with a thickness of at least 0.3mm can also be applied. to make it unaffected.

In addition, the ozone fumigation method of the present invention can also be implemented in the enclosed space 11 surrounded by containers. For example, in the sealing step 901, first check whether there are holes in and around the container, whether the floor is complete, Whether the screw holes are missing screws, whether the rubber strips outside the door are complete, and then lay a canvas 12 slightly larger than the interior floor area of the container at the bottom, so as to avoid the deformation of the pallet loaded with goods due to the loading of goods, which will cause the leakage of ozone 22 gas, and seal it at the same time Ventilation hole on the container, confirm that the door can be closed tightly after the container is loaded, check whether the rubber strip is tight after closing the door, if there is a need for regular monitoring of the concentration, before closing the container opening, pre-fill the fumigated object in the box, box Pipes or ozone concentration sensors are arranged outside to facilitate the detection of the ozone 22 gas concentration in the container. After the preparation step 902, the fumigation operation can be carried out. In addition, in order to prevent the canvas 12 from falling, in addition to fixing it with super glue, And it can be fixed by placing a strong magnet at an appropriate place to enhance the effect of airtight operation.

In the preparation step 902, the ozone generator 21 is installed in the confined space 11. Taking a 20-foot container as an example, the internal gas space of each 20-foot container is 39M ³ , and an ozone generator that generates 10 grams per hour is used. 21. It only takes 5-10 minutes to generate ozone 22 gas with a concentration of 3-5ppm. At this time, the possible hazards caused by the cargo coverage caused by the movement of the container should be considered, so it should be properly fixed.

In the fumigation step 903, affix a seal on the door of the container or warehouse, and affix a warning sign of hazardous substances at the door, clearly stating the concentration of ozone 22, the time of setting, the time of fumigation, the time that can be opened, and the hazard Timely treatment, medical information, contact information, etc.

In the purification step 904, it is performed by professionals wearing protective equipment. After removing the seal, slightly open the cabinet door and put the gas measuring pipeline and exhaust pipeline into the door gap to detect the concentration of ozone 22 and remove ozone 22 gas. Every 30 Measure the ozone 22 gas concentration in minutes until it meets the specification (less than 0.1ppm), and confirm that the ozone 22 gas reaches the target concentration (less than 0.1ppm) before the staff can be arranged to enter and carry out follow-up related operations.

As can be seen from the above description, the ozone fumigation method of the present invention really has the following effects:

1. No air pollution and avoid personal injury:

Because the ozone 22 produced by the ozone generator 21 is fumigated in the closed space 11 in a circular manner, the ozone 22 gas in the closed space 11 will not leak into the external environment, and will not harm the surrounding organisms. Or personnel cause hazards, and use action control technology, use the mobile device 41 to remotely monitor the fumigation step 903, so that the staff can stay away from the confined space 11, so as to achieve fumigation without using aluminum phosphide to produce phosphine toxic gas Grain, so as to avoid industrial safety accidents and protect life and property.

2. Shorten the purification time and leave no residue:

The ozone 22 that enters the closed space 11 reaches the gap of the fumigated objects in the way of flow and diffusion, and performs redox reactions on the harmful organisms, bacteria and molds on the fumigated objects, especially the ozone 22 has photodecomposition And the characteristics of reducing to oxygen at normal temperature can greatly reduce the purification time and produce no residue during the purification step.

3. Delay the time of aging and corruption of fumigated objects:

Based on the above, ozone 22 can kill harmful organisms, bacteria, molds and other harmful substances to fumigated objects, and ozone 22 can oxidize and decompose some pesticides, so it can effectively prolong the aging and corruption time of fumigated objects And improve its storage and preservation time.

4. Prevent the invasion of alien species:

The container is a container for loose goods, and it is also a container commonly used for import and export items. The goods contained in the container have a great chance to seal the organisms or microorganisms from the source of origin. When the container arrives at the destination, the ozone fumigation of the present invention can be directly carried out The method does not need to be moved to other places for fumigation operations, and the ozone 22 can be directly and effectively used to kill organisms and microorganisms in the container, thereby preventing the invasion of alien species.

In summary, the present invention can generate ozone 22 in the confined space 11 by means of internal circulation or external injection, and achieve fumigation of pests without using the poisonous aluminum phosphide of the first class to produce phosphine toxic gas, effectively protecting Surrounding organisms and personnel, prevent staff from poisoning, protect life and property, and the ozone 22 in the confined space 11 can use flow or diffusion to penetrate deep into the gap between the fumigated objects, and can quickly dissipate in the confined space 11 Ozone 22 has the characteristics of photodecomposition and reduction to oxygen at room temperature, which can greatly reduce the purification time and produce no residue, so it can indeed Reach the purpose of the present invention.

But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, All still belong to the scope covered by the patent of the present invention.

11: Confined space

12: Canvas

13: Ground

21: Ozone generator

22: Ozone

31: space bag

41:Mobile devices

901: closed step

902: Preparation steps

903: Fumigation step

904: Purification step

Fig. 1 is a flow chart, is one of preferred embodiment of ozone fumigation method of the present invention; Fig. 2 is a diagram of a state of use, illustrating in this preferred embodiment, the implementation manner in which an ozone generator is arranged in a closed space in the fumigation step; Fig. 3 is a diagram of a state of use, illustrating in this preferred embodiment, the implementation of the fumigation step with the ozone generator arranged outside the confined space; Fig. 4 is a diagram of the state of use, illustrating the implementation of a purification step in the preferred embodiment; and FIG. 5 is a schematic diagram illustrating the display screen of a mobile device in the preferred embodiment, which is used to represent the observation screen for monitoring the fumigation status of the fumigated object and the monitoring of multiple concentration sensors during the fumigation step.

901: closed step

902: Preparation steps

903: Fumigation step

904: Purification step

Claims (8)

An ozone fumigation method, suitable for fumigation of insects in fumigated objects, comprising: a sealing step, placing the fumigated objects in a closed space; a preparation step, preparing at least one ozone generator; a fumigation step, using the ozone The ozone generated by the generator is introduced into the closed space to fumigate the fumigated objects and stand for a period of time. The amount of ozone released in the closed space is 10 grams to 120 grams per hour, and the concentration of ozone in the closed space is 3ppm~5ppm, the maintenance time of ozone in the confined space is 7 days~10 days; and a purification step to reduce or eliminate the concentration of ozone gas in the confined space. The ozone fumigation method as described in Claim 1, wherein, in the preparation step, the ozone generator is placed in the closed space, and after the ozone generator extracts the air in the closed space to produce ozone gas, it releases the ozone gas back to the confined space. The ozone fumigation method as described in Claim 1, wherein, in the preparation step, the ozone generator is placed outside the closed space, and the ozone generator introduces the generated ozone gas into the closed space through a pipeline in space. The ozone fumigation method as described in claim 2 or 3, wherein, in the fumigation step, a concentration sensor is used to detect the ozone gas concentration in the enclosed space, and when the ozone gas concentration is higher or lower than a The ozone generator is turned on and off through a controller at the default value. The ozone fumigation method as described in claim 4, wherein, in the fumigation step, further comprising using a monitor to remotely monitor the fumigation conditions in the confined space, and the monitor can be connected to an external mobile device. The ozone fumigation method as described in claim 5, wherein, in the fumigation step, when the concentration sensor detects that the ozone concentration in the enclosed space reaches 5ppm, the controller is controlled to turn off the ozone generator, and when the concentration sensor detects When the ozone concentration in the confined space is detected to be less than 3ppm, the controller is controlled to start the ozone generator. The ozone fumigation method as described in Claim 1, wherein, in the preparation step, the ozone generator uses a high-voltage current of a certain frequency to create a high-voltage corona electric field, so that oxygen molecules in or around the electric field undergo electrochemical reactions , thereby producing ozone. The ozone fumigation method as described in Claim 1, wherein, in the purifying step, reducing or eliminating the ozone gas concentration in the confined space is to ventilate and exhaust in a diagonal manner in the confined space so that the ozone is rapidly dispersed in the air break down.

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